working popup positioning

src/Avalonia.Native.OSX/window.mm

@@ -5,6 +5,7 @@ class WindowBaseImpl;
 @interface AvnView : NSView
 -(AvnView*)  initWithParent: (WindowBaseImpl*) parent;
 -(NSEvent*)  lastMouseDownEvent;
+-(AvnPoint)translateLocalPoint:(AvnPoint)pt;
 @end
 
 @interface AvnWindow : NSWindow <NSWindowDelegate>
@@ -84,35 +85,56 @@ public:
     }
     
     
-    virtual AvnPoint GetPosition ()
+    virtual HRESULT GetPosition (AvnPoint* ret)
     {
+        if(ret == nullptr)
+        {
+            return E_POINTER;
+        }
+        
         auto frame = [Window frame];
         
         AvnPoint bottomLeft;
         bottomLeft.X = frame.origin.x;
-        bottomLeft.Y = frame.origin.y + frame.size.width;
-        
-        NSRect screen = [NSScreen.screens objectAtIndex:0].frame;
-        
-        auto t = MAX(screen.origin.y, screen.origin.y + screen.size.height);
+        bottomLeft.Y = frame.origin.y + frame.size.height;
         
-        bottomLeft.Y = t - bottomLeft.Y;
+        *ret = ConvertPointY(bottomLeft);
         
-        return bottomLeft;
+        return S_OK;
     }
     
     virtual void SetPosition (AvnPoint point)
     {
-        NSPoint nspoint;
-        nspoint.x = point.X;
-        nspoint.y = point.Y;
+        [Window setFrameTopLeftPoint:ToNSPoint(ConvertPointY(point))];
+    }
+    
+    virtual HRESULT PointToClient (AvnPoint point, AvnPoint* ret)
+    {
+        if(ret == nullptr)
+        {
+            return E_POINTER;
+        }
         
-        NSRect screen = [NSScreen.screens objectAtIndex:0].frame;
-        auto t = MAX(screen.origin.y, screen.origin.y + screen.size.height);
+        point = ConvertPointY(point);
+        auto viewPoint = [Window convertScreenToBase:ToNSPoint(point)];
         
-        nspoint.y = t - nspoint.y;
+        *ret = [View translateLocalPoint:ToAvnPoint(viewPoint)];
         
-        [Window setFrameTopLeftPoint:nspoint];
+        return S_OK;
+    }
+    
+    virtual HRESULT PointToScreen (AvnPoint point, AvnPoint* ret)
+    {
+        if(ret == nullptr)
+        {
+            return E_POINTER;
+        }
+        
+        auto cocoaViewPoint =  ToNSPoint([View translateLocalPoint:point]);
+        auto cocoaScreenPoint = [Window convertBaseToScreen:cocoaViewPoint];
+        *ret = ConvertPointY(ToAvnPoint(cocoaScreenPoint));
+        
+        return S_OK;
     }
     
 protected:
@@ -235,7 +257,6 @@ protected:
         }
     }
     
-    
     auto timestamp = [event timestamp] * 1000;
     auto modifiers = [self getModifiers:[event modifierFlags]];
     

src/Avalonia.Native/WindowImplBase.cs

@@ -170,6 +170,25 @@ namespace Avalonia.Native
             set => _native.SetPosition(value.ToAvnPoint());
         }
 
+        public Point PointToClient(Point point)
+        {
+            return _native.PointToClient(point.ToAvnPoint()).ToAvaloniaPoint();
+        }
+
+        public Point PointToScreen(Point point)
+        {
+            return _native.PointToScreen(point.ToAvnPoint()).ToAvaloniaPoint();
+        }
+
+        public void Hide()
+        {
+            _native.Hide();
+        }
+
+        public void BeginMoveDrag()
+        {
+            _native.BeginMoveDrag();
+        }
 
         #region Stubs
         public double Scaling => 1;
@@ -201,30 +220,10 @@ namespace Avalonia.Native
         {
         }
 
-        public void Hide()
-        {
-            _native.Hide();
-        }
-
-        public void BeginMoveDrag()
-        {
-            _native.BeginMoveDrag();
-        }
-
         public void BeginResizeDrag(WindowEdge edge)
         {
         }
 
-        public Point PointToClient(Point point)
-        {
-            return point;
-        }
-
-        public Point PointToScreen(Point point)
-        {
-            return point;
-        }
-
         #endregion
     }
 }

src/headers/avalonia-native.h

@@ -73,8 +73,10 @@ AVNCOM(IAvnWindowBase, 02) : virtual IUnknown
     virtual HRESULT Resize(double width, double height) = 0;
     virtual void Invalidate (AvnRect rect) = 0;
     virtual void BeginMoveDrag () = 0;
-    virtual AvnPoint GetPosition () = 0;
+    virtual HRESULT GetPosition (AvnPoint*ret) = 0;
     virtual void SetPosition (AvnPoint point) = 0;
+    virtual HRESULT PointToClient (AvnPoint point, AvnPoint*ret) = 0;
+    virtual HRESULT PointToScreen (AvnPoint point, AvnPoint*ret) = 0;
 };
 
 AVNCOM(IAvnPopup, 03) : virtual IAvnWindowBase